Apache ActiveMQ is the Apache Software Foundation's open-source, multi-protocol Java message broker supporting JMS and many wire protocols. The project site links to components, client libraries, documentation, downloads, and community support channels for self-hosted messaging.
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ActiveMQ pricing questions
Is ActiveMQ free?
Yes. ActiveMQ has an ongoing free plan. ActiveMQ is Apache-licensed open-source software distributed from the project site without a vendor SaaS subscription.
How much does ActiveMQ cost?
ActiveMQ is listed as free. No paid plan with a published price was found.
Does ActiveMQ have an API?
API or developer access is mentioned. Project navigation lists NMS and CMS clients plus protocol support for integrating producers and consumers.